I added an event for a future month and went back an hour later and it was gone. I added it again as as an all day event instead of an appt and again it disappeared. I've tried everything from removing the battery, turing it on/off, etc. Any ideas?

It's blowing my mind also. I put it on the calendar for 9/19 and it's automatically deleting. I entered an event for 10/11 and 8/13 and both of those saved. I tried deleting old events thinking I needed more space but that didn't work. I think the 19th is cursed!